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HANNA HI96728 Nitrate LR 0.0-30.0 mg/L Portable Photometer for Freshwater and Marine (REFURBISHED UNIT - EXCELLENT CONDITION)
Please note this is a refurbished unit (as good as new!) REAGENTS NOT INCLUDED - SOLD SEPARATELY
The HI96728 Nitrate-Nitrogen Portable Photometer combines accuracy and ease of use in an ergonomic, portable design. A user can accurately determine the concentration of nitrate as nitrogen in samples (including tropical and marine water environments) within a 0.0 to 30.0 mg/L (ppm) range using the HI93728-0 ready made reagents. The HI96728 offers many advanced features including the exclusive CAL Check™function used for performance verification and calibration of the meter.
CAL Check™ Validation and Calibration
Automatic shut off
The HI96728 portable photometer is for the measurement of nitrate as nitrogen. Hanna's portable photometers feature an advanced optical system; the combination of a special tungsten lamp, a narrow band interference filter, and silicon photodetector ensure accurate photometric readings every time. The Hanna exclusive CAL Check™ feature utilizes ready-made, NIST traceable standards to verify both meter validation and calibration. The exclusive cuvette locking system ensures that the cuvette is inserted into the measurement cell in the same position every time to maintain a consistent path length.
CAL Check™ - Allows for performance verification and calibration of the meter using a CAL Check NIST traceable secondary standard.
GLP - Records the date of the last user calibration performed.
Built in timer - Allows the use of a timer to ensure the appropriate 3 minutes and 30 seconds reaction time is used for the chemical reaction. At the end of the timer countdown the meter will automatically take the reading. This feature ensures consistency across multiple users.
Indexing indent on meter - The meter has an indent that allows for a lock and key fit with the cuvette cap. This ensures that the cuvette is indexed consistently (same position) in order to maintain the same path length for accurate results.
Cooling Lamp Indicator - It is necessary to maintain a consistent temperature of the optical components in order to maintain a narrow wavelength band of light. This photometer has a cooling lamp indicator that is displayed for a short period of time before each measurement in order to allow the components to cool and obtain the highest accuracy possible.
Error messages - Messages on display alerting to problems including no cap, over range and under range readings, and light source error.
Auto-shut off - Automatic shut off after 10 minutes of non-use when the meter is in measurement mode. Prevents wastage of batteries in the event the meter is accidentally not turned off.
Battery status indicator
The instrument has a battery level indicator to display reaming life as follows:
• 3 lines for 100 % capacity
• 2 lines for 66 % capacity
• 1 line for 33 % capacity
• Battery icon blinks when the capacity is less than 10 %.
Units of measure - Appropriate unit of measure is displayed along with reading.
Nitrogen is abundant in the Earth’s atmosphere and is present in water in the form of nitrate, nitrite, and ammonia. Plants use nitrogen as a nutrient to build proteins by tracking it in through their root system. Nitrate is formed in water mainly through rainfall, decomposition of organic matter, and runoff from manmade pollutants such as sewage waste and fertilizers. Almost all surface waters have a measurable level of nitrate, and a moderate amount is considered beneficial. Large amounts of nitrate, however, can lead to eutrophication which may result in decreased levels of dissolved oxygen in the water.
The HI96728 uses an adaptation of the cadmium reduction method to measure nitrate concentrations of less than 30.0 mg/L (ppm) as nitrogen. When the reagent is added to samples containing nitrate, the sample will turn an amber hue; the greater the concentration, the deeper the color. The associated color change is then colorimetrically analyzed according to the Beer-Lambert Law. This principle states that light is absorbed by a complementary color, and the emitted radiation is dependent upon concentration. For nitrate-nitrogen determination, a narrow band interference filter at 525 nm (green) allows only green light to be detected by the silicon photodetector and omits all other visible light emitted from the tungsten lamp. As the change in color of the reacted sample increases, absorbance of the specific wavelength of light also increases, while transmittance decreases.
The HI96728 is also available as a kit (HI96728C) which includes:
Sample cuvettes (2)
CAL Check™ standards with certificate
Cuvette cleaning cloth
Rugged carrying case
Thermoformed insert for meter and accessories
*Reagents ordered separately
CAL Check™ standards with certificate
The HI96728-11 CAL Check™standards are used for calibration and performance verification of photometers with the CAL Check™ function.
Supplied with Certificate of Analysis
Standard value @ 25 °C
Reference meter NIST traceable
Provided storage containers
Protects from accidental breakage
silicon photocell with narrow band interference filter @ 525 nm
0.0 to 30.0 mg/L (ppm) NO₃-N (nitrate-nitrogen)
0.1 mg/L (ppm)
Accuracy @ 25°C (77°F)
±0.5 mg/L ±10% of reading
adaptation of the cadmium reduction method
after ten minutes of non-use in measurement mode; after one hour of non-use in calibration mode; with last reading reminder
0 to 50°C (32 to 122°F); RH max 95% non-condensing
193 x 104 x 69 mm (7.6 x 4.1 x 2.7”)
HI96728 is supplied with sample cuvettes (2) with caps, 9V battery, instrument quality certificate and instruction manual.
Please note this is a refurbished unit (as good as new!)